unsigned char buf[1000];
read_bytes=read(0,buf,sizeof(buf));
send_bytes=sendto(send_fd,buf,read_bytes,0,(struct sockaddr *)&remote_addr,remote_addr_len);
unsigned char buf[1000];
read_bytes=read(0,buf,sizeof(buf));
send_bytes=sendto(send_fd,buf,read_bytes,0,(struct sockaddr *)&remote_addr,remote_addr_len);